atlas upgrade program
DESCRIPTION
ATLAS Upgrade Program . Erez Etzion, Tel Aviv University. LHC timeline. ATLAS Muon Spectrometer. TGC. MDT. CSC. Thin Gap Chambers. Muon trigger. Why upgrade ?. Performance of the muon tracking chambers will be degraded with the luminosity increase - PowerPoint PPT PresentationTRANSCRIPT
ATLAS Upgrade Program
Erez Etzion, Tel Aviv UniversityApril 10th,
2014
E. Etzion,
RECFA meeting,
Tel Aviv
1
E. Etzion, RECFA meeting, Tel Aviv
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LHC timeline
April 10th, 2014
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ATLAS Muon Spectrometer
April 10th, 2014
CSC
MDT
TGC
E. Etzion, RECFA meeting, Tel Aviv
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Thin Gap Chambers
April 10th, 2014
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Muon trigger
April 10th, 2014
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Why upgrade ?
April 10th, 2014
- Performance of the muon tracking chambers will be degraded with the luminosity increase
- Muon end caps trigger will have too high fake rate
Range tube rate200-300 kHz
Average luminosity : 9.6 1032 cm-2 s-1
luminosity : 1034 cm-2 s-1
Sim
ula
ted
hit
rat
e (H
z/cm
2)
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NSW trigger concept0 Increased Phase I backgrounds, but must maintain
existing trigger rate0 Filter “Big Wheel” muon candidates to remove tracks
that are not from the IPOnly track “A” should be a trigger candidate.
0 Challenge is latency: 500nsec for electronics + 500ns fibres to be in time for Big Wheel
0 Micromegas: 2M strips, 0.5mm0 sTGC: 280K strips (3.2mm), 45K pads, 28K wires0 sTGC, MM find candidates
independently, list merged for Sector Logic
0 Hit per layer:sTGC: hit is centroid of 3-5 stripsMicromegas: hit is address of strip
April 10th, 2014
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Detector layout
April 10th, 2014
Present Small Wheel – defines basic layout and envelopes0 16 detector layers in total0 2 technologies, MicroMegas and sTGC
9.3m
sTGCs: primary trigger detector
0 Bunch ID with good timing resolution – additional suppression of fakes
0 Good space resolution providing track vectors with < 1 mrad angular resolution
0 Based on proven TGC technology; Pads & strips, instead of only strips
as in current detector
Micro-Mesh Gaseous detectors (Micromegas): primary precision tracker 0 Space resolution < 100 m independent of μ
track incidence angle 0 Good track separation due to small
0.5 mm readout granularity (strips) 0 Excellent high rate capability due to small
gas amplification region and small space charge effects
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sTGCBased on TGC technology0 Lower cathode resistance
– for high rates0 Pads
– online trigger tower0 Strip charge readout
– precision coord. readout0 Wire readout
– coarse f coord.
0 Pads coincidence defines ROI and select strips to send to sTGC trig processor where precise position is calculated
April 10th, 2014
sTGC geometry
Wire-carbon gap 1.4 mm
Wire-wire space 1.8 mm
Strip pitch 3.2 mm
Inter strip gap 0.5 mm
Gas mixure CO2:n-pentane (55:45)
Wire potential 2.9 kV
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Construction sites
April 10th, 2014
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Muon test beam set up0 Muon test beams at CERN (180 Gev)0 Two quadruplets equipped with ASD, two monitor chambers (small TGC
chambers M1 and M2) and two scintillators
April 10th, 2014
M1 M2L1 L2 L3 L4
L5 L6 L7 L8
Sc1 Sc2
Mechanical system that allows to rotate the TGC with high accuracy
Combined test with sMDT
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Position resolutionResolution : difference between expected position from track fit (3 planes) and measured position (4th plane)
Position resolution as a function of the incidence angle for the different layers of a sTGC
Demonstrated homogeneity of the quadruplet Resolution < 100 mm
Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2011 IEEE
April 10th, 2014
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Irradiation with neutrons
April 10th, 2014
• Test in Demokritos (Greece) :
• Cosmic muons tracking under neutron (5.5-6.5 MeV) irradiation
• No drastic degradation of the efficiency : less than 4% at the highest dose rate
• No sparks observed
90 Ef
fici
ency
rate for L=1035 cm-2s-1
s
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Irradiation with 60Co source
April 10th, 2014
• Tests at Nahal Soreq (IL).• Cosmic muons detection under gamma (~50 Ci 60Co source)
irradiation.• sTGC is 120x70cm2 was totally irradiated.
No efficiency deterioration observed for a flux of 2.104 Hz/cm2
Position resolution and efficiency measurements with large scale Thin Gap Chambers for the super LHC, arXiv:1006.0135 [physics.ins-det]
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nSW - Electronics
April 10th, 2014
· nSW Trigger Processor. A collaboration of Arizona, Brookhaven, Bucharest, Harvard, Saclay, UC Irvine, Weizmann. The Israeli team focuses on the sTGC part. · Front-end electronics ASIC. Testing and characterization of the FEE ASIC at Weizmann and Technion.· sTGC Front-end boards – collaborating with USTC on the requirements of the sTGC FE boards · New readout for Phase I and Phase II. A collaborative effort of Argonne, Brookhaven, CERN and Weizmann (initiators!) to develop common readout the shared across ATLAS. It is moves substantial functionality which was previously custom hardware for each detector to commercial PC servers and software. · nSW Electronics coordinator - L. Levinson (Weizmann)
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New FE ASIC for the nSW : VMM0 New ASIC common for MM and sTGC designed in
2011. Israel started testing in 2012 0 Front end provides
0 64 channels0 Time to peak0 Time over threshold0 Adjustable gain : from 0.5 to 9 V/pC0 Adjustable peaking time : from 25 to 200 ns0 Threshold per channel
April 10th, 2014
VMM1—An ASIC for Micropattern Detectors, G de Geronimo IEEE Trans.Nucl.Sci. 99 (2013) 1–8.
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Result sTGC strip + VMM1
April 10th, 2014
In last test beam, strip readout was realized with ASD and VMM
ASD analog output (HV=2.85 kV)
VMM 3mV/fC (HV=2.85kV)
VMM 9mV/fC (HV=2.7kV)
Except for a few minor problems, all VMM features are working VMM2
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Simulation
April 10th, 2014
0 Weizmann (S. Bressler) and Irvine U are working on L1 simulation looking at the PADs trigger
0 U. of Michigan and University of Science and Technology of China are working on the strip trigger side.
0 Technion (A. Di Mattia) responsible for the integration in Athena.
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Prototype status
April 10th, 2014
60 x 40 quadruplets• Used to develop concept to
construct sTGC• Training field for the new teams
Module -1• First development of full size
sTGC• The type to be built in China• Parts are available and assembly
underway
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Status Israel
April 10th, 2014
0 Israel provides overall project coordination0 PL – G. Mikenberg0 Construction at Weizmann inst.0 Cosmic ray testing at Tel Aviv0 Electronics developments at Weizmann and Technion0 Test beam coordination Tel Aviv & Weizmann
0 Basic infrastructure well established0 Focusing on development of assembly techniques0 Knowledge transfer to Canada, Chile, China, US0 Recently invested in producing a 40cm x 60cm quadruplet
prototype0 Developed drawings for full size modules0 Production of prototype for the testbeam
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Man power
April 10th, 2014
Instititue Physicists Engineers / Technicians
Post docs Students
Technion S. Tarem N. LupoA. Vdovin
A. Di Mattia
Weizmann I. G. MikenbergL. LevisonD. LellouchV. SmakhtinS. Bressler
M. ShoaB. PasmantierJ. Narevicius, A. Roich8 technicians for instatation
Tel Aviv U. Y. BenhammouE. Etzion
M. Ben Moshe M. Davies A. AshkenaziH. Cohen
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Funding
April 10th, 2014
Institute Source budget
Technion I-Core equipmentISF nSWAida (Gif++)
530 k$ *1000 k$ (10 years)*30 k euro (5 years)
Weizmann I. I-Core equipmentISF nSWISF (IL-china) + for jigsMinervaAida (Gif++)
360 k$1000 k$ (10 years)100 k$/year100 k$3 * 50 k euro20 k$
Tel Aviv U. I-Core equipmentISF nSW
206 k$1000 k$ (10 years)
• ISF nSW 3M$ paid to CERN in 10 years.• I-Core is an estimated extrapolation. Last two years we got ~30%
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Summary0 nSW an approved international collaborative effort for the ATLAS upgrade0 As in the ATLAS construction days a common Israeli effort !0 Supported by ISF / institutes and iCORE.0 nSW goal is to support high flux radiation without loss of trigger
efficiency and position resolution0 Sandwich with micromegas : MM for tracking purpose and sTGC for
trigger (fully redundant)0 First prototype of a new front end designed for MM and sTGC gave good
results0 Module-1 will go for testbeam at Fermilab on May 20140 MUON & nSW week in Israel on June.0 Working toward installation on 2018.
April 10th, 2014